Opioid Conversion Ratios - Guide to Practice 2010

Transcription

1 Opioid Conversion Ratios - Guide to Practice 2010 Released December The EMR PCC grants permission to reproduce parts of this publication for clinical and educational use only, provided that the Eastern Metropolitan Region Palliative Care Consortium is acknowledged. Requests to reproduce this document, for purposes other than those stated above, should be addressed to: Consortium Manager Eastern Metropolitan Region Palliative Care Consortium PO Box 227, Nunawading VIC 3131 Australia Final December For review June 2013

2 TABLE OF CONTENTS Instructions for use 3 Disclaimer 3 General Notes 3 Oral Morphine to other oral analgesics 4 Oral opioids to parenteral opioids 4 Parenteral Morphine to other parenteral analgesics 5 Parenteral Fentanyl to transdermal Fentanyl 5 Fentanyl lozenges 5 Transdermal Fentanyl to Morphine 6 Intranasal Fentanyl 6 Transdermal Buprenorphine to oral Morphine 7 Methadone 8 Abbreviations 9 References 9 Acknowledgements and Contributors 10 Summary Chart Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 2 of 12

3 INSTRUCTIONS FOR USE Printing: It is highly recommended these guidelines are printed in colour, to aid ease of use. The access point for the current electronic version of these guidelines is at Eastern Metropolitan Region Palliative Care Consortium or Centre for Palliative Care DISCLAIMER The information in this document is to be used as a guideline only. It is the responsibility of the user to ensure information contained in this document is used correctly. These guidelines reflect current Australian/Victorian palliative care practice and available literature at the time of the guideline release. Printed versions can only be considered up-to date for a period of one month from the printing date, after which the latest version should be downloaded from the Eastern Metropolitan Region Palliative Care Consortium website. All medication doses derived from these guidelines should be checked and prescribed by a medical doctor with appropriate experience before administering. Medication doses should be modified in response to the patient/client s clinical situation and status, including previous exposure to opioids and concurrent medications. Adhere to all legislation and professional requirements including organisational policies and procedures regarding opioid medications and their administration. All patients should be monitored closely until stable when commencing, adjusting dosage and/or switching opioid medications. GENERAL NOTES 1. Where there are differences in the literature regarding opioid conversion ratios, Australian/Victorian references have been used. 2. Pethidine has not been included in this document, as its use in palliative care is not recommended Allowing for Incomplete Cross-Tolerance - When switching from one opioid to another, the new opioid may have increased potency, even if from a similar class of analgesic. Dosage of the new opioid therefore should be based upon several factors, including available equi-analgesic dose data, clinical condition of the patient, concurrent medications and patient safety. It is recommended that the new opioid dose should be reduced by 30% - 50% to allow for incomplete cross-tolerance. The patient should be monitored and assessed closely when a change is made from one opioid medication to another. 6,7 4. When changing from one opioid to another (when not morphine), always convert to oral morphine first. For example if converting from transdermal fentanyl to transdermal buprenorphine, first convert transdermal fentanyl to oral morphine then convert from oral morphine to transdermal buprenorphine. 5. Sufentanil has been removed from this edition. The medication is only used by specialised palliative care services as it is only available through the special access scheme. 3 Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 3 of 12

4 Oral to Oral Conversion Ratio Morphine to Tramadol 1:5 ORAL MORPHINE TO OTHER ORAL ANALGESICS Comments Oral Morphine 10 mg = Oral Tramadol 50 mg Tramadol has a limited role in managing moderate-severe pain in palliative care. 1 1 Ref. Morphine to Codeine 1:8 Oral Morphine 7.5 mg = Codeine 60 mg 1 Morphine to Methadone - CONSULTANT REQUIRED. See methadone conversion on p8 for more information. Morphine to Oxycodone 1.5:1 Oral Morphine 15 mg = Oral Oxycodone 10 mg 1,2,11 Morphine to Hydromorphone 5:1 Oral Morphine 5 mg = Oral Hydromorphone 1 mg If changing drugs start at ½ the conversion dose and titrate according to response. 3 1,2,3,11 ORAL OPIOIDS TO PARENTERAL OPIOIDS (SC, IV, IM) same drug to same drug Oral Parenteral Ratio Calculation Comments Ref. Morphine Morphine 2-3:1 Oral Morphine 30 mg = Subcutaneous Morphine mg 1 Oxycodone Oxycodone 2:1 Oral Oxycodone 10 mg = Subcutaneous Oxycodone 5 mg The variability of bioavailability requires the conversion to be conservative. Titrate according to response 3 1,3,5 Hydromorphone Hydromorphone 3:1 Oral Hydromorphone 15 mg = Subcutaneous Hydromorphone 5mg 1 Methadone Methadone 2:1 Oral Methadone 20mg = Subcutaneous Methadone10 mg Tramadol Tramadol 1.5:1 Oral Tramadol 150 mg = Parenteral Tramadol 100 mg Consultation with a palliative care specialist or pain clinic is advised. Tramadol has a limited role in managing moderate-severe pain in palliative care. 1,2,11 1 Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 4 of 12

5 From SC, IV, IM To SC, IV, IM PARENTERAL (SC, IV, IM) MORPHINE TO OTHER PARENTERAL (SC, IV, IM) ANALGESICS Ratio Calculation Comments Ref. Morphine Fentanyl 100:1 Morphine 10,000 micrograms = Fentanyl 100 micrograms Morphine 10 mg = Fentanyl 100 micrograms Morphine 100 mg = Fentanyl 1 mg (1000 micrograms) 1,2,3 Morphine Hydromorphone 5:1 Morphine 10 mg = Hydromorphone 2 mg Morphine Tramadol 1:10 Morphine 10 mg = Tramadol 100 mg Differing conversion ratios are provided in the literature depending on the duration of opioid exposure, the route of administration and the direction of the switch (Morphine : Hydromorphone or Hydromorphone : Morphine) 2,5,6 Close monitoring and titration for each individual is required. See General Note 3 Tramadol has a limited role in managing moderate-severe pain in palliative care. 1,2,4,5 1,2 Morphine Oxycodone 1:1 Morphine 10 mg = Oxycodone 10 mg 1,2,5,11 PARENTERAL FENTANYL & TRANSDERMAL FENTANYL - same drug to same drug Ratio Calculation Ref. Parenteral Fentanyl Transdermal Fentanyl 1:1 Fentanyl 600 micrograms / 24 hours = Fentanyl patch 25 micrograms/hour 14,15, TRANSMUCOSAL FENTANYL LOZENGES Fentanyl lozenges offer a faster onset of relief than oral or subcutaneous morphine in breakthrough pain. Transmucosal fentanyl should only be used in patients who are already receiving opioids, and are opioid tolerant. A patient should be receiving at least 60mg of oral morphine equivalents per day, or 50 micrograms transdermal fentanyl per hour, if transmucosal fentanyl is to be considered for breakthrough pain 5. At present, there is no direct conversion ratio between morphine and transmucosal fentanyl. The Manufacturer notes, National Prescribing Service website, and MIMS suggest using a titration method to arrive at the optimum dose, commencing with 200micrograms. 5,7,8 Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 5 of 12

6 Patch Strength Fentanyl Patch 12 Fentanyl Patch 25 Fentanyl Patch 50 Fentanyl Patch 75 Fentanyl Patch 100 Dose Parenteral Morphine equivalent (mg/24 hours) TRANSDERMAL FENTANYL TO MORPHINE Oral Morphine equivalent (mg/24 hours) 288 mcg/24 hours 10 to to 45 Break through pain management 5mg immediate release oral morphine 1 hourly / p.r.n. 600 mcg/24 hours 30 to to 100* 10mg immediate release oral morphine 1 hourly / p.r.n mcg/24 hours 60 to to 200* 20mg immediate release oral morphine 1 hourly / p.r.n mcg/24 hours 90 to to mg immediate release oral morphine 1 hourly / p.r.n mcg/24 hours 120 to to mg immediate release oral morphine 1 hourly / p.r.n. 1 Ref *The Mims Narcotic Prescribing Guide 2009/2010, p46 gives a higher oral morphine: transdermal patch range 5. CONVERSION CALCULATION TRANSDERMAL FENTANYL TO ORAL MORPHINE Transdermal fentanyl to oral morphine conversion rate = 1: Ref 1, 2, 5, 11 Using 25 micrograms/hour Fentanyl as example: 25 mcg / hour x 24 = 600 mcg / 24 hours 600mcg x 100 (conversion) = micrograms morphine = 60 mg oral morphine or 600mcg x 150 (conversion) = micrograms morphine = 90 mg oral morphine Comments - When commencing transdermal fentanyl, peak serum concentration generally occurs between 24 and 72 hours 5. - When ceasing transdermal fentanyl, there will be a therapeutic benefit for a period of time (half-life from 22 to 25 hours) 5. - To ensure pain relief is maintained, carefully consider the timing of the next dose of analgesic. INTRANASAL FENTANYL Intranasal Fentanyl solutions are being administered in some clinical settings to provide rapid management of breakthrough pain. Use is not confined to palliative care. Fentanyl is well absorbed into the nasal mucosa with approximately 70% bioavailability. Administration is with an atomisation device. Further information is available in 2, 9, 10, 12 Therapeutic Guidelines (etg complete) fentanyl analogues section. Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 6 of 12

7 TRANSDERMAL BUPRENORPHINE to ORAL MORPHINE Patch Strength Delivery Rate Conversion Ratio Oral Morphine Dose Parenteral morphine dose Buprenorphine 5 mg/7 days 120 micrograms/24 hours 5 micrograms/hour 1: mg/24 hours 4 6 mg/24 hours Buprenorphine10 mg/7 days 240 micrograms/24 hours 10 micrograms/hour 1: mg/24 hours 8 12 mg/24 hours Buprenorphine 20 mg/7 days 480 micrograms/24 hours 20 micrograms/hour 1: mg/24 hours mg/24 hours Maximum dose of 40mcg/hour (2 x 20mcg/hour patches) 1,3 CONVERSION CALCULATION TRANSDERMAL BUPRENORPHINE TO ORAL MORPHINE Ref. 2, 11 5 mg patch = 5 micrograms buprenorphine per hour 5 mcg x 24 = 120 micrograms over 24 hours 120mcg buprenorphine x 100 (conversion) = 12,000mcg Convert 12000mcg to mg by 1000 = 12 mg oral morphine over 24 hours CONVERSION CALCULATION ORAL MORPHINE TO TRANSDERMAL BUPRENORPHINE Ref.1 30 mg morphine over 24 hours: (conversion) = 0.3 mg buprenorphine Convert 0.3mg to mcg by x 1000 = 300 micrograms buprenorphine over 24 hours = 12.5 micrograms/hour Round to 10 mg buprenorphine patch Comment - Breakthrough pain is treated with immediate release morphine or oxycodone. - Buprenorphine is a partial opioid receptor antagonist so withdrawal symptoms may be experienced in patients who have developed physical dependence on opioids 7. - In overdose, buprenorphine is only partially reversed by naloxone. 7 - After removal of the buprenorphine patch, a short acting opioid should be prescribed for the initial 24 hours and a long acting opioid commenced after 24hours 1. Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 7 of 12

8 METHADONE Conversion to methadone from other opioids is complex, and should not be attempted without consultation with a specialist experienced in the use of methadone. Consultation is of particular importance for the higher doses shaded in red below. It is strongly recommended that Methadone therapy be initiated in the inpatient setting where patients can be closely monitored for signs of cumulative toxicity (commonly sedation or confusion). Methadone is lipophilic - care must be taken to avoid toxicity as it may take several days to reach steady-state plasma concentrations. Elimination half-life is lengthy and highly variable between individuals. Conversion methods used by palliative care physicians vary considerably and there is no clear-cut evidence to support one method over another. Conversions should be based on current daily oral morphine equivalent dosage. 7, 13 Method: 1. Stop original opioid when commencing methadone. 2. Days 1 and 2 - give calculated daily dose (see table below) plus 25-50% extra (as loading, to saturate tissues), give in 4 divided doses (6 hourly). Omit loading dose in frail, elderly or in those on long-acting sedatives. 3. Days 3 and 4 give calculated daily dose (without the loading) in 3 divided doses (8 hourly). 4. Day 5 onwards give calculated daily dose in 2 divided doses (12 hourly). 5. Use short-acting opioids for breakthrough pain (e.g. oxycodone, morphine). Daily oral morphine equivalent dose Royal Perth Methadone Conversion Protocol 13 METHADONE CONVERSION RATIO Ref.3,7,13 Conversion Ratio Less than 100 mg 3:1 Daily oral Methadone dose I.e. 3 mg morphine: 1 mg methadone 0 to 30 mg methadone 101 mg to 300 mg 5:1 20 mg to 60 mg methadone 301 mg to 600 mg 10:1 30 mg to 60 mg methadone 601 mg to 800 mg 12:1 50 mg to 65 mg methadone 801 mg to 1000 mg 15:1 50 mg to 65 mg methadone More than 1000 mg 20:1 50 mg methadone The EMR PCC Clinical Working Party gratefully acknowledges the following palliative care physicians for their contribution to the methadone section in the 2008 guidelines 7 : Shirley Bush; Kate Jackson; Brian Le; Peter Martin; Greg Mewett and Peter Poon. Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 8 of 12

9 ABBREVIATIONS USED IN THESE GUIDELINES b.d = twice (2) times daily Parenteral = administration via SC,IM or IV routes IM = Intramuscular p.r.n. = as required/when necessary IV = Intravenous q.i.d. = four (4) times daily mcg = micrograms SC = subcutaneous mg = milligrams t.d.s = three (3) times daily 1 mg = 1000 micrograms REFERENCES ) Palliative Care Expert Group 2010, Therapeutic Guidelines: Palliative Care.2010 Version 3. Therapeutic Guidelines Limited: Melbourne. 2) Palliativedrugs.com Ltd. Accessed Feb Aug ) Australian Medicines Handbook Pty Ltd 2010, Australian Medicines Handbook (online) July Ch3-analgesics>opioid analgesic. Accessed August ) Wallace, M, Rauck, RL, Moulin, D, Thipphawong, J, Khanna, S & Tudor, IC, 2008, Conversion from Standard Opioid Therapy to Once daily Oral Extended- release Hydromorphone in Patients with Chronic Cancer Pain. Journal of International Medical Research, 36: ) Mundipharma, 2009, MIMS Narcotic Analgesics Prescribing Guide 2009/2010. Sydney: Mundipharma Pty Ltd. 6) Periera, J, Lawlor, P, Vigano, A, Dorgan, M, Breura, E, 2001 Equianalgesic Dose ratios for Opioids: A Critical Review and Proposals for Long Term Dosing. Journal of Pain and Symptom Management, 22: ) Eastern Metropolitan Region Palliative Care Consortium Opioid Working Party, Opioid Conversion Ratios- guide to practice Oct ) National Prescribing Service Ltd Accessed August ) Therapeutic Guidelines Limited. etg complete [Online]. Melbourne: Therapeutic Guidelines Limited. Accessed March Aug ) Good, P, Jackson, K, Brumley, D, and Ashby, M, 2009, Intranasal sufentanil for cancer associated breakthrough pain. Palliative Medicine, 23: ) Twycross, R & Wilcock, A, (eds), 2007 Palliative Care Formulary Third Edition; palliativedrugs.com Ltd: Nottingham. 12) Zeppetella, G. 2000, An assessment of the safety and efficacy, and acceptability of intranasal fentanyl citrate in the management of cancer-related breakthrough pain: a pilot study, Journal of Pain & Symptom Management; 20(4): ) Ayonrinde, OT & Bridge DT, 2000, The rediscovery of methadone for cancer pain management, MJA, 173: ) Prommer, E, 2009; The Role of Fentanyl in Cancer -Related Pain, Journal of Palliative Medicine 12(10): ) Watanabe, S, Pereira J, Hanson, J & Bruera, E, 1998, Fentanyl by Continuous Subcutaneous Infusion for the Management of Cancer pain: A Retrospective Study. Journal of Pain and Symptom Management, 16 (5) Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 9 of 12

10 ACKNOWLEDGEMENTS & CONTRIBUTORS EMRPCC Clinical Working Party (2010) Eastern Health: Dr J. Moran, Mr S. O Neill, Mr A. Goff Eastern Palliative Care: Dr P. Sherwen; Mr D. Halliwell EMRPCC: Ms C. Brusamarello Centre for Palliative Care: Dr J Philip, Ms K. Quinn RDNS: Ms H. Carr. Special Acknowledgements: Tracey Mander and the members of the original EMRPCC Opioid Clinical Working Party (2008). Annette Culley - Medical Librarian, St Vincent s/caritas Christi Hospice Melbourne. Gedal Basman Pharmacist, St Vincent s Hospital Melbourne. The EMRPCC Clinical Working Party welcomes feedback regarding the planned formal review process in Please send comments to: Consortia Manager, Eastern Metropolitan Region Palliative Care Consortium PO Box 227, Nunawading VIC 3131 Australia or consortiumamanager@epc.asn.au Eastern Metropolitan Region Palliative Care Consortium (Victoria) Opioid Conversion Guidelines Page 10 of 12

11 Opioid Conversion Ratios - Guide to Practice 2010 Summary Chart The entire document must be viewed at ORAL MORPHINE TO OTHER ORAL ANALGESICS Oral to Oral Conversion Ratio Example Morphine to Tramadol 1:5 Oral Morphine 10 mg = Oral Tramadol 50 mg Morphine to Codeine 1:8 Oral Morphine 7.5 mg = Codeine 60 mg Morphine to Methadone - CONSULTANT REQUIRED. Morphine to Oxycodone 1.5:1 Oral Morphine 15 mg = Oral Oxycodone 10 mg Morphine to Hydromorphone 5:1 Oral Morphine 5 mg = Oral Hydromorphone 1 mg ORAL TO PARENTERAL same drug to same drug Oral Parenteral Ratio Working example Hydromorphone Hydromorphone 3:1 Oral Hydromorphone 60 mg = Subcutaneous Hydromorphone 20 mg Morphine Morphine 2-3:1 Oral Morphine 30 mg = Subcutaneous Morphine mg Methadone Methadone 2:1 Oral Methadone 20 mg = Subcutaneous Methadone 10 mg Oxycodone Oxycodone 2:1 Oral Oxycodone 20 mg = Subcutaneous Oxycodone 10 mg PARENTERAL (SC,IV,IM) MORPHINE TO OTHER PARENTERAL (SC,IV,IM) ANALGESICS From SC, IV, IM To SC, IV, IM Ratio Calculation Morphine Fentanyl 100:1 Morphine 10mg = Fentanyl 100mcg Morphine Hydromorphone 5:1 Morphine 10 mg = Hydromorphone 2 mg See full guidelines for information Morphine Tramadol 1:10 Morphine 10 mg = Tramadol 100 mg Morphine Oxycodone 1:1 Morphine 10 mg = Oxycodone 10 mg Eastern Metropolitan Region Palliative Care Consortium (Victoria) - Clinical Working Party Opioid Conversion Ratios Guide to Practice

12 Patch Strength Fentanyl Patch 12 Fentanyl Patch 25 Fentanyl Patch 50 Fentanyl Patch 75 Fentanyl Patch 100 TRANSDERMAL FENTANYL TO MORPHINE Dose 288 mcg/24 hours 600 mcg/24 hours 1200 mcg/24 hours 1800 mcg/24 hours 2400 mcg/24 hours Parenteral Morphine equivalent (mg/24 hours) Oral Morphine equivalent (mg/24 hours) 10 to to to to to to to to to to 400 Breakthrough pain management 5 mg immediate release oral morphine 1 hourly p.r.n. 10 mg immediate release oral morphine 1 hourly p.r.n. 20 mg immediate release oral morphine 1 hourly p.r.n. 30 mg immediate release oral morphine 1 hourly p.r.n. 40 mg immediate release oral morphine 1 hourly p.r.n. CONVERSION CALCULATION TRANSDERMAL FENTANYL TO ORAL MORPHINE Transdermal fentanyl to oral morphine conversion ratio = 1: Using 25micrograms/hour Fentanyl as example: 25mcg/hour x 24 = 600mcg/24 hours 600mcg x 100 (conversion) = micrograms morphine = 60 mg oral morphine or 600mcg x 150 (conversion) = micrograms morphine = 90 mg oral morphine TRANSDERMAL BUPRENORPHINE to ORAL MORPHINE Patch Strength Delivery Rate Conversion Ratio Oral Morphine Dose Parenteral morphine dose Buprenorphine 5 mg / 7 days 120 micrograms/24 hours Buprenorphine 10 mg / 7 days 240 micrograms/24 hours Buprenorphine 20 mg / 7days 480 micrograms/24 hours 5 micrograms/hour 1: mg/24 hours 4 6 mg/24 hours 10 micrograms/hour 1: mg/24 hours 8 12 mg/24 hours 20 micrograms/hour 1: mg/24 hours mg/24 hours CONVERSION CALCULATION TRANSDERMAL BUPRENORPHINE TO ORAL MORPHINE 5 mg patch = 5 micrograms buprenorphine per hour 5 mcg x 24 = 120 micrograms over 24 hours 120mcg buprenorphine x 100 (conversion) = 12,000mcg Convert 12000mcg to mg by 1000 = 12 mg oral morphine over 24 hours CONVERSION CALCULATION ORAL MORPHINE TO TRANSDERMAL BUPRENORPHINE 30 mg morphine over 24 hours: (conversion) = 0.3 mg buprenorphine Convert 0.3mg to mcg by x 1000 = 300 micrograms buprenorphine over 24 hours = 12.5 micrograms/hour Round to 10 mg buprenorphine patch DISCLAIMER: The information contained in this summary is to be read in conjunction with the entire document. The guidelines reflect current Australian/Victorian palliative care practice and available literature at the time of the release. All medication doses should be checked and prescribed by a medical doctor with appropriate experience before administering. Adhere to all legislative and professional requirements including organisational policies and procedures regarding opioid medications and their administration. All patients should be monitored closely until stable when commencing, adjusting dosage and/or switching opioid medications. Eastern Metropolitan Region Palliative Care Consortium (Victoria) - Clinical Working Party Opioid Conversion Ratios Guide to Practice